chore(deps): bump org.testng:testng from 6.4 to 7.9.0

Bumps [org.testng:testng](https://github.com/testng-team/testng) from 6.4 to 7.9.0.
- [Release notes](https://github.com/testng-team/testng/releases)
- [Changelog](https://github.com/testng-team/testng/blob/master/CHANGES.txt)
- [Commits](testng-team/testng@testng-6.4...7.9.0)

---
updated-dependencies:
- dependency-name: org.testng:testng
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -16,7 +16,7 @@ buildscript {
         // workaround for reckon issue with Java 8
         grgitVersion = "5.2.2"
 
-        testngVersion = "6.4"
+        testngVersion = "7.9.0"
         jakartaVersion = "6.0.0"
         jakartaValidationVersion = "3.0.2"